🌐 coolblue.dev 400 🔒 SSL Valid
Checked: just now 🔗 Visit site
HTTP Status ?A three-digit code showing if the site loaded successfully (200), redirects (301/302), or has errors (4xx/5xx).Read more →
400
SSL Expires ?When the SSL certificate expires. An expired certificate causes browser security warnings.Read more →
in 128d
Domain Expires ?When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
in 131d
Hosting ?The company and location where this website's server is physically located.Read more →
Unknown
Security ?Score based on key HTTP security headers: HSTS, Content-Security-Policy, and X-Frame-Options.Read more →
0/3
IP Address ?The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
91.184.0.200
Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
N/A
Uptime
100%
⚡ Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
▼

Performance data not available yet.

🛠️ Tech Stack ?Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools. 1
▼
🖥️ Web Server
Apache
📸 Screenshot Processing...
▼
⏳

Screenshot is being captured...

🌐 DNS Records ?DNS translates domain names to IP addresses. Records control where the site, email, and services are directed.Read more →
▼
A (IPv4)91.184.0.200
AAAA (IPv6)2a02:2268:1::f816:3eff:fe7b:63c6
NSns02.hostnet.nlns01.hostnet.nl
TXT (1)
v=spf1 include:_spf.hostnet.nl -all
📋 WHOIS / RDAP ?Public registration data: who registered the domain, when, and when it expires.Read more →
▼
RegistrarKey-Systems LLC
Registered2019-02-28
Expires2027-02-28 (in 131 days)
Last Updated2026-04-14
Statusclient transfer prohibited
🔒 SSL Certificate ?Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
▼
Subject (CN)*.hostnetbv.nl
IssuerSectigo Limited
Valid From2026-01-26
Valid Until2027-02-25 (128 days left)
SANs (2)*.hostnetbv.nlhostnetbv.nl
📡 HTTP Headers ?Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
▼
Status400
ServerApache
Content-Typetext/html; charset=iso-8859-1
Final URLhttps://coolblue.dev/
Security headers ?HTTP headers that protect visitors from attacks. HSTS forces HTTPS, CSP controls resource loading, X-Frame-Options prevents clickjacking.Read more →
HSTS
Content-Security-Policy
X-Frame-Options
🏠 Hosting ?Physical infrastructure: where the server is, who operates it, and what network it belongs to.Read more →
▼
IP Address91.184.0.200
ProviderUnknown
OrganizationN/A
ASNN/A
LocationN/A
🛡️ Security Score F (1/7)
▼
Valid SSL
HSTS
CSP
X-Frame-Options
X-Content-Type
Referrer-Policy
Permissions-Policy
🗺️ Sitemap & Robots
▼
No robots.txt
This site has no robots.txt file, so crawlers may access everything by default.
Sitemap Not found
🔗 Social & Meta Tags Missing
▼
Title400 Bad Request
📧 Mail Security ?Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
▼
SPF✓ Present
v=spf1 include:_spf.hostnet.nl -all
DMARC✓ Present
v=DMARC1; p=reject
🌍 Other TLDs ?Other top-level domain variants of this domain name and their availability. 19 active 3 for sale 1 available
▼
.com ●
.net ●
.org ●
.info ●
.io taken
.co taken
.dev current
.app taken
.me ●
.biz ●
.eu ●
.xyz Available
.fi ●
.se ●
.de ●
.uk ●
.fr ●
.nl ●
.es ●
.it ●
.us ●
.ca ●
.com.au ●
.co.uk ●
📡 Uptime Monitor
▼
Current Status 🟢 Client Error
HTTP Status 400
Response Time 256ms
Last Checked 2026-10-19 02:30:31.582336
Uptime (30d) 100%